Reason: AMGN's overbought extension cooled - RSI down to 64.9 from 72.8, though still just -3.23% off a fresh 52-week high; TMO's rally decelerated sharply; VRTX's reversal-higher gave back most of its gains; MRNA's weekly print turned positive even as its distance from a 52-week high hit a fresh low.

Tape Read

$AMGN is the story this cycle: last read's breakout into overbought (RSI 72.8) has cooled — RSI 64.9 (down from 72.8), the weekly print decelerated sharply to +2.43% (was +7.33%), 30D +6.6% (was +9.03%), and it's now -3.23% off its 52-week high (was -1.23%) — still uptrend regime (downgraded from breakout), still the closest name to a fresh high in the group. $TMO's overbought extension eased too: RSI 68.8 (down slightly from 70.3, back under the 70 line), the weekly print decelerated sharply to +1.06% (was +10.12%), -10.82% off its 52-week high, still death-crossed. $VRTX's reversal-higher gave back most of its gains: RSI 48.4 (down from 56.7), 7D turned roughly flat at -0.05% (was +1.74%), 30D deepened to -4.2% (was -1.85%) — still golden-crossed and uptrend, though the improvement flagged last cycle didn't hold. $MRNA showed another split signal: RSI held roughly flat at 40.9 (was 40.3), and the weekly print turned positive to +1.39% (was -6.45%) — but it's now -35.96% off its 52-week high (was -34.81%), a fresh low on that measure even as the week improved. Source: full-scan pre-computed summaries as of the 2026-07-31 close — biotech ($MRNA, $VRTX, $TMO) and biotech-scan ($AMGN, tracked outside the core biotech watchlist).

• $AMGN — WATCH (roughly steady): RSI 64.9 (down from 72.8, cooling out of overbought), -3.23% off 52wk high (was -1.23%) — still the closest name to a fresh high in the group even as the breakout extension unwinds.
• $TMO — WATCH (upgraded from PASS): RSI 68.8 (down slightly from 70.3, back under the overbought line), weekly print decelerated sharply to +1.06% (was +10.12%) — the extension is cooling rather than deepening.
• $VRTX — PASS (downgraded from WATCH): RSI 48.4 (down from 56.7), 30D deepened to -4.2% (was -1.85%) — last cycle's reversal-higher gave back most of its gains.
• $MRNA — WATCH (upgraded from PASS): RSI 40.9 (roughly flat from 40.3), weekly turned positive to +1.39% (was -6.45%) — though -35.96% off its 52-week high is a fresh low on that measure.

Lead pick: $AMGN remains the best-positioned name in the basket — still nearest to a fresh 52-week high even as its overbought extension cools off. $MRNA is the one to flag for its split read: a genuinely positive week sitting inside a fresh low on distance-from-high.

Sources

• Tape data (price/RSI/SMA/returns): full-scan pre-computed summaries as of the 2026-07-31 close — biotech ($MRNA, $VRTX, $TMO) and biotech-scan ($AMGN, tracked outside the core biotech watchlist).